class_docstr: This class implements a model-specific automatic speech recognizer using the end-to-end speech recognizer
  DeepSpeech and PyTorch. It supports both version 2 and version 3 of DeepSpeech models as released at
  https://github.com/SeanNaren/deepspeech.pytorch.
  
  | Paper link: https://arxiv.org/abs/1512.02595
docstr: Return the optimizer.
  
  :return: The optimizer.
docstr_tok: ["Return","the","optimizer",".",":","return",":","The","optimizer","."]
code: def optimizer(self) -> "torch.optim.Optimizer":
      """
      Return the optimizer.
  
      :return: The optimizer.
      """
      return self._optimizer
  
imports: import logging
  from typing import TYPE_CHECKING, List, Optional, Tuple, Union
  from pkg_resources import packaging
  import numpy
  from art import config
  from art.estimators.pytorch import PyTorchEstimator
  from art.estimators.speech_recognition.speech_recognizer import SpeechRecognizerMixin, PytorchSpeechRecognizerMixin
  from art.utils import get_file
label_desc: Use image node_id 14 for calling the PyTorchDeepSpeech obj's underlying member method code with example usage: obj.optimizer() and returns: self